US20040177503A1 - Method for the production of a forged piston for an internal combustion engine - Google Patents
Method for the production of a forged piston for an internal combustion engine Download PDFInfo
- Publication number
- US20040177503A1 US20040177503A1 US10/734,806 US73480603A US2004177503A1 US 20040177503 A1 US20040177503 A1 US 20040177503A1 US 73480603 A US73480603 A US 73480603A US 2004177503 A1 US2004177503 A1 US 2004177503A1
- Authority
- US
- United States
- Prior art keywords
- piston
- unmachined
- welding
- parting
- oxidation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/10—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass pistons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/18—Making machine elements pistons or plungers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/0015—Multi-part pistons
- F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J1/00—Pistons; Trunk pistons; Plungers
- F16J1/005—Pistons; Trunk pistons; Plungers obtained by assembling several pieces
- F16J1/006—Pistons; Trunk pistons; Plungers obtained by assembling several pieces of different materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/0015—Multi-part pistons
- F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
- F02F2003/0061—Multi-part pistons the parts being connected by casting, brazing, welding or clamping by welding
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F2200/00—Manufacturing
- F02F2200/04—Forging of engine parts
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49229—Prime mover or fluid pump making
- Y10T29/49249—Piston making
- Y10T29/49256—Piston making with assembly or composite article making
Definitions
- a method for the production of a piston or piston head for an internal combustion engine is described in PCT/DE02/02768, which solves the aforementioned problem in that a ring-shaped recess is worked into the face of an unmachined part consisting of steel, which recess is subsequently filled with an oxidation-resistant material, by means of welding. Subsequently, the unmachined part is forged to produce a piston, and afterwards finished to produce a piston ready for installation.
- the result achieved by the forging, i.e. forming process is that the oxidation-resistant material comes to rest at the edge of the combustion depression of the piston.
- the relatively large number of process steps is a disadvantage, making the production of such a piston more expensive and ineffective.
- a method for the production of a forged piston for an internal combustion engine comprising forming the piston from a first cylindrical unmachined part having at least one flat face made of oxidation-resistant steel and a second cylindrical unmachined part having at least one flat face made of hot-forgeable steel, with the same diameters, in each instance, to produce a piston blank by forging.
- the unmachined parts are brought together at their faces and aligned with respect to their diameters, so that the faces form a minimal projection and parting.
- the parting is then closed completely from the outside, by producing a weld seam that runs over the circumference.
- the piston blank is then finished via machining to produce a piston ready for installation in the internal combustion engine.
- the parting can be closed by welding at room temperature or in a heated state of the unmachined parts.
- the unmachined parts before forging, are heated to a temperature of 1100° C. to 1300° C., and the unmachined parts are subsequently forged to produce a piston blank, in the heated state.
- the heating process takes place inductively.
- the welding is preferably arc welding, laser welding, or electron beam welding.
- FIG. 1 is a schematic diagram of the sequence of the production method according to the invention, in Steps A to D;
- FIG. 2 is a schematic diagram of another variant of the production method according to the invention, in Step A.
- FIG. 1 shows according to method step A), a cylindrical unmachined part made of oxidation-resistant steel, referred to as 1 , having a flat face 3 formed at a right angle to its longitudinal axis 9 , which face is produced by means of a lathing work step, for example.
- the unmachined part 1 consists of a material that has improved oxidation-resistance at temperatures above 500° C., such as the steel X45CrSi9, for example, or other suitable steels, or consists of materials based on nickel, cobalt, or titanium.
- Another cylindrical unmachined part made of hot-forgeable steel, referred to as 2 that preferably consists of a material 42CrMo4 or 38MnSiVS5, also has a flat face 4 formed at a right angle to its longitudinal axis 9 .
- the two unmachined parts possess approximately the same diameter d, in each instance. Fundamentally, it can be determined by way of the height h 1 of the unmachined part 1 what piston regions of the piston 10 , such as the depression edge region 6 a, the complete combustion depression 6 , or also parts of the ring part 7 , are supposed to consist of oxidation-resistant material.
- the two unmachined parts can be subjected to a cleaning and degreasing process, using known means, in order to achieve grease-free, dust-free, and oxidation-free joining surfaces, in other words particularly faces 3 and 4 .
- a sufficient cleanliness quality is provided by the cutting process used to produce the join surfaces, i.e. faces.
- the unmachined parts 1 and 2 are brought together at their flat faces 3 and 4 by means of suitable holding means (not shown), and aligned with respect to their diameters d, so that faces 3 and 4 form a minimal projection and a minimally spaced parting 12 .
- Parting 12 is completely closed over the circumference of the unmachined parts by means of a welding process, for example arc welding, laser welding, or electron beam welding, or other known connection methods.
- a welding process for example arc welding, laser welding, or electron beam welding, or other known connection methods.
- unmachined parts 1 and 2 can be heated before the welding process takes place, but this is not absolutely necessary for successfully implementing the method.
- unmachined part 1 takes place as a result of the forging process, by forming a join.
- the oxidation-resistant material in other words unmachined part 1 , is formed so that it comes to rest in the region of resulting depression edge 6 a, i.e. the entire combustion depression 6 .
- Local flow of the material as a result of the forging process, into the region of ring part 7 can also not be precluded.
- the temperature is conducted in such a way that the two steel materials are present in the desired heat treatment state.
- unmachined part 1 is structured as a ring-shaped part, whose join surface, i.e. face 3 is structured to be conical or parallel to the plane of longitudinal axis 9 of the unmachined part, and against which face 4 of unmachined part 2 , also structured to be conical or plane-parallel, comes to rest in such a way that the join surfaces, i.e. faces 3 and 4 form a minimal projection and a minimally spaced parting 12 relative to one another.
- the production method according to the invention can also be carried out using forged unmachined parts 1 and 2 .
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Forging (AREA)
Abstract
A method for the production of a forged piston for an internal combustion engine, having a combustion depression provided on the piston head. The piston is formed from a first cylindrical unmachined part having at least one flat face made of oxidation-resistant steel and a second cylindrical unmachined part having at least one flat face made of hot-forgeable steel, with the same diameters (d), in each instance. The two unmachined parts are formed to produce a piston blank by means of forging, causing the combustion depression to be formed from oxidation-resistant steel. Subsequently the piston blank is finished via machining to produce a piston ready for installation in the internal combustion engine. Production of a piston having a reduced tendency to oxidize at the edge of the depression, and improved protection against wear caused by erosion, which is simple cost-effective, is achieved in that the unmachined parts are brought together at their faces and aligned with respect to their diameters, so that the faces form a minimal projection and parting. Subsequently, the parting is completely closed from the outside, by a weld seam that runs over the circumference.
Description
- 1. Field of the Invention
- The invention relates to a method for the production of a forged piston for an internal combustion engine, having a combustion depression provided on the piston head. The piston is formed from a first cylindrical unmachined part having at least one flat face made of oxidation-resistant steel and a second cylindrical unmachined part having at least one flat face made of hot-forgeable steel, with the same diameters. The two unmachined parts are formed via forging to produce a piston blank and subsequently finished via machining to produce a piston ready for installation in the internal combustion engine.
- 2. The Prior Art
- In order to increase the performance of modern internal combustion engines, particularly diesel engines, the compression pressures and thereby the temperatures in the combustion space are constantly being increased. The result of this measure is that after running of the engine, oxidation is found on the steel piston having a combustion depression, or on steel piston heads, which oxidation particularly occurs at the edge of the depression, as a function of the operating temperature that was reached. This oxidation can lead to the formation of cracks and thereby to failure of the component. Likewise, material wear at the piston head, along the fuel injection tracks, is also critical, and makes protection against erosion wear necessary. Known solutions for improving this situation are, for example, coating the finished piston with an oxidation-resistant layer in the region of the edge of the depression, by means of plasma-spraying or application welding of more oxidation-resistant materials onto the pre-finished piston.
- A method for the production of a piston or piston head for an internal combustion engine is described in PCT/DE02/02768, which solves the aforementioned problem in that a ring-shaped recess is worked into the face of an unmachined part consisting of steel, which recess is subsequently filled with an oxidation-resistant material, by means of welding. Subsequently, the unmachined part is forged to produce a piston, and afterwards finished to produce a piston ready for installation. The result achieved by the forging, i.e. forming process, is that the oxidation-resistant material comes to rest at the edge of the combustion depression of the piston. However, the relatively large number of process steps is a disadvantage, making the production of such a piston more expensive and ineffective.
- A different solution is described in PCT Publication No. WO 02/06658 A1, in that a cylinder-shaped unmachined part made of chromium steel, i.e., an oxidation-resistant steel, is connected with a second cylinder-shaped unmachined part consisting of conventional steel (SE 4140), by means of friction welding, and subsequently formed into a piston by means of hot-forging. The piston is subsequently subjected to final finishing. A disadvantage of this process is that the two unmachined parts must be rigidly connected over a certain area, i.e. at their faces. The production method therefore requires a complicated pre-processing step for the production of a piston. In addition, because of the friction welding, a rather sizable degree of welding flash occurs on the circumference, which must be removed before the forging process by lathing or grinding, since the blank joined together in this way cannot be placed into the forging mold, and the welding flash material does not permit perfect forming with a resulting good metallic connection.
- It is therefore an object of the invention to provide a production method for a piston having a reduced tendency to oxidize at the edge of the depression, and improved protection against wear caused by erosion, in a simple and cost-effective manner.
- This and other objects are achieved by a method for the production of a forged piston for an internal combustion engine, the piston having a combustion depression provided on the piston head, comprising forming the piston from a first cylindrical unmachined part having at least one flat face made of oxidation-resistant steel and a second cylindrical unmachined part having at least one flat face made of hot-forgeable steel, with the same diameters, in each instance, to produce a piston blank by forging. The unmachined parts are brought together at their faces and aligned with respect to their diameters, so that the faces form a minimal projection and parting. The parting is then closed completely from the outside, by producing a weld seam that runs over the circumference. The piston blank is then finished via machining to produce a piston ready for installation in the internal combustion engine.
- The parting can be closed by welding at room temperature or in a heated state of the unmachined parts.
- In a preferred embodiment, before forging, the unmachined parts, which have been welded together, are heated to a temperature of 1100° C. to 1300° C., and the unmachined parts are subsequently forged to produce a piston blank, in the heated state. Preferably, the heating process takes place inductively. The welding is preferably arc welding, laser welding, or electron beam welding.
- With the production method according to the invention, full-area welding of the cylindrical unmachined parts with steel faces is no longer necessary, and the cutting process for removal of the welding flash, which is usually necessary, because of the friction welding process that is usually applied, becomes superfluous. The method for the production of a piston becomes more effective, since there is now a free choice of the welding process that can be used, and it becomes more economical in its implementation, because there is one processing step less.
- This is because it has surprisingly been shown that a bubble-free as well as slag-free metallic bond is produced on the piston blank after forging, by closing only the parting that is formed by laying the faces of the two unmachined parts against one another, by means of welding from the outside over the entire circumference.
- Other objects and features of the present invention will become apparent from the following detailed description considered in connection with the accompanying drawings. It is to be understood, however, that the drawings are designed as an illustration only and not as a definition of the limits of the invention.
- In the drawings, wherein similar reference characters denote similar elements throughout the several views:
- FIG. 1 is a schematic diagram of the sequence of the production method according to the invention, in Steps A to D; and
- FIG. 2 is a schematic diagram of another variant of the production method according to the invention, in Step A.
- Referring now in detail to the drawings, FIG. 1 shows according to method step A), a cylindrical unmachined part made of oxidation-resistant steel, referred to as1, having a
flat face 3 formed at a right angle to its longitudinal axis 9, which face is produced by means of a lathing work step, for example. Theunmachined part 1 consists of a material that has improved oxidation-resistance at temperatures above 500° C., such as the steel X45CrSi9, for example, or other suitable steels, or consists of materials based on nickel, cobalt, or titanium. Another cylindrical unmachined part made of hot-forgeable steel, referred to as 2, that preferably consists of a material 42CrMo4 or 38MnSiVS5, also has aflat face 4 formed at a right angle to its longitudinal axis 9. The two unmachined parts possess approximately the same diameter d, in each instance. Fundamentally, it can be determined by way of the height h1 of theunmachined part 1 what piston regions of thepiston 10, such as the depression edge region 6 a, the complete combustion depression 6, or also parts of thering part 7, are supposed to consist of oxidation-resistant material. - In another method step (not shown), the two unmachined parts can be subjected to a cleaning and degreasing process, using known means, in order to achieve grease-free, dust-free, and oxidation-free joining surfaces, in other words particularly faces3 and 4. In general, a sufficient cleanliness quality is provided by the cutting process used to produce the join surfaces, i.e. faces.
- In method step B), the
unmachined parts flat faces parting 12.Parting 12 is completely closed over the circumference of the unmachined parts by means of a welding process, for example arc welding, laser welding, or electron beam welding, or other known connection methods. In order to avoid joining stresses,unmachined parts - Forming of
unmachined parts unmachined parts - The actual “welding together” of
unmachined parts unmachined part 1, is formed so that it comes to rest in the region of resulting depression edge 6 a, i.e. the entire combustion depression 6. Local flow of the material as a result of the forging process, into the region ofring part 7, can also not be precluded. During subsequent cooling from the forging heat, the temperature is conducted in such a way that the two steel materials are present in the desired heat treatment state. - Subsequently, finishing of the piston blank to produce a
piston 10 that can be used in an internal combustion engine, having the desired combustion depression 6,ring part 7, pin hub 8, etc., takes place by machining. - In another exemplary embodiment according to method step A) according to FIG. 2,
unmachined part 1 is structured as a ring-shaped part, whose join surface, i.e.face 3 is structured to be conical or parallel to the plane of longitudinal axis 9 of the unmachined part, and against whichface 4 ofunmachined part 2, also structured to be conical or plane-parallel, comes to rest in such a way that the join surfaces, i.e. faces 3 and 4 form a minimal projection and a minimally spacedparting 12 relative to one another. Depending on the inside diameter d1 and the height h1 of ring-shapedunmachined part 1, it is determined whether the complete depression edge 6 a, only the upper part of the depression edge that reached to the combustion space or, in addition, also part of thering part 7 consists of the oxidation-resistant material. - Surprisingly, it has been shown that no differences in the structure are evident after the forging process according to method step C), whether the
circumferential weld seam 11 is arranged on the circumference and/or on thecover surface 13 ofunmachined parts - The production method according to the invention can also be carried out using forged
unmachined parts - Accordingly, while only a few embodiments of the present invention have been shown and described, it is obvious that many changes and modifications may be made thereunto without departing from the spirit and scope of the invention.
- Reference Symbols
- Cylindrical unmachined part made of oxidation-
resistant steel 1 - Cylindrical unmachined part made of hot-
forgeable steel 2 - Flat face of the
unmachined part 1 3 - Flat face of the
unmachined part 2 4 -
Piston blank 5 - Combustion depression6
- Depression edge6 a
-
Ring part 7 - Pin hub8
- Longitudinal axis of the
unmachined parts -
Piston 10 -
Weld seam 11 -
Parting 12 -
Cover surface 13 - Diameter of the
unmachined parts 1, 2 d - Diameter of the
unmachined part 1 in a second embodiment d1 - Height of the unmachined parts h1, 2
Claims (5)
1. A method for the production of a forged piston for an internal combustion engine, the piston having a combustion depression provided on the piston head, comprising the steps of:
forming the piston from a first cylindrical unmachined part having at least one flat face made of oxidation-resistant steel and a second cylindrical unmachined part having at least one flat face made of hot-forgeable steel, with the same diameters, to produce a piston blank by forging, said step of forming comprising:
bringing together the unmachined parts at their faces and aligning them with respect to their diameters, so that the faces form a minimal projection and parting; and
closing the parting completely from the outside, by producing a weld seam that runs over the circumference;
causing the combustion depression to be formed in the oxidation-resistant steel, and
finishing the piston blank via machining to produce a piston ready for installation in the internal combustion engine.
2. The method according to claim 1 , wherein the parting is closed by welding at room temperature or in a heated state of the unmachined parts.
3. The method according to claim 2 , wherein before forging, the unmachined parts, which have been welded together, are heated to a temperature of 1100° C. to 1300° C., and the unmachined parts subsequently forged to produce the piston blank, in the heated state.
4. The method according to claim 3 , wherein the heating takes place inductively.
5. The method according to claim 2 , wherein the welding is arc welding, laser welding, or electron beam welding.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10311150.6 | 2003-03-14 | ||
DE10311150A DE10311150A1 (en) | 2003-03-14 | 2003-03-14 | Method of manufacturing a forged piston for an internal combustion engine |
Publications (1)
Publication Number | Publication Date |
---|---|
US20040177503A1 true US20040177503A1 (en) | 2004-09-16 |
Family
ID=32892170
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/734,806 Abandoned US20040177503A1 (en) | 2003-03-14 | 2003-12-12 | Method for the production of a forged piston for an internal combustion engine |
Country Status (2)
Country | Link |
---|---|
US (1) | US20040177503A1 (en) |
DE (1) | DE10311150A1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040173169A1 (en) * | 2001-07-14 | 2004-09-09 | Karlheinz Bing | Cooled ring carrier for a piston |
EP1719900A1 (en) * | 2005-05-04 | 2006-11-08 | Pistal Racing S.r.L. | High density metal alloy piston for internal combustion engine and process for manufacturing such piston |
US20090301165A1 (en) * | 2006-05-04 | 2009-12-10 | Gesenkschmiede Schneider Gmbh | Device for forging bush-shaped objects and a forged part produced therewith |
JP2013538982A (en) * | 2010-10-05 | 2013-10-17 | マーレ インターナショナル ゲゼルシャフト ミット ベシュレンクテル ハフツング | Piston assembly |
US8973484B2 (en) | 2011-07-01 | 2015-03-10 | Mahle Industries Inc. | Piston with cooling gallery |
CN104439031A (en) * | 2014-11-26 | 2015-03-25 | 慈溪市天润电器实业有限公司 | Cold heading forming manufacturing method for piston part of refrigeration compressor |
US9909527B2 (en) | 2014-08-27 | 2018-03-06 | Federal-Mogul Llc | Hybrid induction welding process applied to piston manufacturing |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007052498A1 (en) | 2007-11-02 | 2009-05-07 | Mahle International Gmbh | Manufacturing forged piston for internal combustion engine with piston shaft and piston head, comprises inserting holder for insert parts into a casting mold, fixing the insert part in the holder by retaining means, and casting a cast part |
DE102007052499A1 (en) | 2007-11-02 | 2009-05-07 | Mahle International Gmbh | Piston i.e. forged piston, manufacturing method for internal combustion engine, involves forming piston sleeve in stages to piston such that core material forms part of piston head and cladding material forms part of ring portion |
DE102011013141A1 (en) * | 2011-03-04 | 2012-09-06 | Mahle International Gmbh | Method for producing a piston for an internal combustion engine |
DE102014211366A1 (en) | 2013-06-14 | 2014-12-18 | Ks Kolbenschmidt Gmbh | Method for producing an oxidation protection layer for a piston for use in internal combustion engines and pistons with an oxidation protection layer |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3872275A (en) * | 1973-12-12 | 1975-03-18 | Thermatool Corp | Forge welding with induction coil heating |
US4517930A (en) * | 1982-09-28 | 1985-05-21 | Kawasaki Jukogyo Kabushiki Kaisha | Piston of combustion engine |
US6026777A (en) * | 1998-10-07 | 2000-02-22 | Mahle Gmbh | Piston having a barrel of forged steel and a cooling channel |
US6032570A (en) * | 1998-04-10 | 2000-03-07 | Yamaha Hatsudoki Kabushiki Kaisha | Composite piston for machine |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3304903A1 (en) * | 1983-02-12 | 1984-08-16 | Alfred Teves Gmbh, 6000 Frankfurt | Piston for the hydraulic and/or mechanical power transmission to a component to be acted upon, especially on the brake shoes of a disc brake |
BR9005371A (en) * | 1990-10-18 | 1992-06-16 | Metal Leve Sa | EMBOLO MANUFACTURING PROCESS WITH REFRIGERATION GALLERY |
GB0016443D0 (en) * | 2000-07-04 | 2000-08-23 | United Eng Forgings Ltd | A piston head and a method of making a piston head |
-
2003
- 2003-03-14 DE DE10311150A patent/DE10311150A1/en not_active Withdrawn
- 2003-12-12 US US10/734,806 patent/US20040177503A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3872275A (en) * | 1973-12-12 | 1975-03-18 | Thermatool Corp | Forge welding with induction coil heating |
US4517930A (en) * | 1982-09-28 | 1985-05-21 | Kawasaki Jukogyo Kabushiki Kaisha | Piston of combustion engine |
US6032570A (en) * | 1998-04-10 | 2000-03-07 | Yamaha Hatsudoki Kabushiki Kaisha | Composite piston for machine |
US6026777A (en) * | 1998-10-07 | 2000-02-22 | Mahle Gmbh | Piston having a barrel of forged steel and a cooling channel |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040173169A1 (en) * | 2001-07-14 | 2004-09-09 | Karlheinz Bing | Cooled ring carrier for a piston |
US7069881B2 (en) * | 2001-07-14 | 2006-07-04 | Mahle Gmbh | Cooled ring carrier for a piston |
EP1719900A1 (en) * | 2005-05-04 | 2006-11-08 | Pistal Racing S.r.L. | High density metal alloy piston for internal combustion engine and process for manufacturing such piston |
US20090301165A1 (en) * | 2006-05-04 | 2009-12-10 | Gesenkschmiede Schneider Gmbh | Device for forging bush-shaped objects and a forged part produced therewith |
US8302447B2 (en) | 2006-05-04 | 2012-11-06 | Gesenkschmiede Schneider Gmbh | Device for forging bush-shaped objects and a forged part produced therewith |
JP2013538982A (en) * | 2010-10-05 | 2013-10-17 | マーレ インターナショナル ゲゼルシャフト ミット ベシュレンクテル ハフツング | Piston assembly |
US9856820B2 (en) | 2010-10-05 | 2018-01-02 | Mahle International Gmbh | Piston assembly |
US8973484B2 (en) | 2011-07-01 | 2015-03-10 | Mahle Industries Inc. | Piston with cooling gallery |
US9909527B2 (en) | 2014-08-27 | 2018-03-06 | Federal-Mogul Llc | Hybrid induction welding process applied to piston manufacturing |
CN104439031A (en) * | 2014-11-26 | 2015-03-25 | 慈溪市天润电器实业有限公司 | Cold heading forming manufacturing method for piston part of refrigeration compressor |
Also Published As
Publication number | Publication date |
---|---|
DE10311150A1 (en) | 2004-09-23 |
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